反向断裂下盘较顺向断裂上盘更易富集油气机理的定量解释

doi:10.13278/j.cnki.jjuese.201603108

Abstract

Abstract:

To study the control effect of faults to oil-gas accumulation and distribution in oil-gas bearing basins, based on the study of mechanism and influence factors of faults lateral sealing, we made a quantitative explanation of mechanism about foot wall of antithetic faults accumulating more oil-gas than hanging wall of consequent faults. Antithetic faults and consequent faults both sealed oil-gas by fault rock and displacement pressure of fault rock in oil-gas migration direction, which were the main factors to influence its lateral sealing oil-gas ability. Under the similar conditions of faults buried depth and dip, layer lithology and dip, theoretically, the shale content of antithetic faults was larger than consequent faults, which mean that displacement pressure of antithetic fault rock in oil-gas migration direction was larger than consequent fault rock, and lateral sealing ability of antithetic faults was stronger than consequent faults, thus, the foot wall of antithetic faults accumulated more oil-gas than the hanging wall of consequent faults. We made an investigation on fault rock displacement pressure in oil-gas migration direction from foot wall of Banqiao fault under conditions of antithetic and consequent, in lower Es¹ of Qikou sag. It indicated that, displacement pressure in oil-gas migration direction of antithetic fault rock was larger than consequent fault rock in foot wall of Banqiao fault in lower Es¹, with stronger lateral sealing ability, which was favor of oil-gas accumulating in Es¹, foot wall of Banqiao fault.

Key words: antithetic fault, consequent fault, fault rock, displacement pressure in oil-gas migration direction, oil-gas accumulation, quantitative explanation

CLC Number:

P618.13

Wei Danning, Fu Guang. Quantitative Explanation of Mechanism About Lower Wall of Antithetic Faults Accumulating More Oil-Gas than Upper Wall of Consequent Faults[J].Journal of Jilin University(Earth Science Edition), 2016, 46(3): 702-710.

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Quantitative Explanation of Mechanism About Lower Wall of Antithetic Faults Accumulating More Oil-Gas than Upper Wall of Consequent Faults

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